Cita APA (7th ed.)
Steel, E. W. (1960). Water supply and sewerage (4th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Steel, E. W. Water Supply and Sewerage. 4th ed. New York: McGraw-Hill, 1960.
Cita MLA (9th ed.)
Steel, E. W. Water Supply and Sewerage. 4th ed. McGraw-Hill, 1960.
Atenció: Aquestes cites poden no estar 100% correctes.